单项选择题

Mary is busy ______ for her final exam.

A．preparing
B．prepare
C．prepared
D．prepares
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单项选择题
--Are you coming to the English evening --I'm not sure. I ______ go to the concert instead.
A．must
B．woul0
C．should
D．might
单项选择题
The car is running at the ______ of 40 kilometers an hour.
A．rates
B．rating
C．rate
D．rated
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